Motor-controlling rheostat.



W. C. YATES. MOTOR GONTRGLLING RHEOSTAT.

APPLICATION FILED JULY 3, 1907.

910,343. Patented Jan. 19,1909.

1o its' object the -e ected in a re NITED strains PATENT. canton-f.-

wmnn c. Yarns,

or sonsuncrAnY, New Yositnssicuonro ernaast caserme COMPANY, CORPORATION 'OF NEW YORK.

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restarts ran. 1o, isos,

application mea .my s, 19er. saisine. senesi.

To all whmn 'it mag/commi:

Beit known that I, WILLIAM C; Yarns, a. citizen of, the United States, residing at Schenectad, county of Schenectady, State ef New Yor have invented certain new and useful Improvements in Motor-'Controlling Rheostats,cf which the following is a specieation.,`

This' invention relates to devices for controlling electric motor circuits and has for rovision of a device of, this character in w ich the motor speed may be re lated and a able, simple and eiiicient manner. l

My invention re ates more specifically to devices for starting electric motors and vary ing the speed thereof ater the running con 1 position in Fig. 3 is a side elevation o tions have been established.

In carrying out my invention I provide in connection with thev starting and speedregulating resistances, a controlling arm for each mounted independently and springpressed to return to 1ts initial osition. The starting arm isvspri-ng-presse to the starting position while the field arm is springpressed arms are so arranged that when the starting arm is moved to running position a pair of gears, one on the field controlling arm and the other on the operating handle of the starting arm, are caused to meshl so that by turning the operating handle the field resist' ance may be varied. I also provide means whereby as the starting arm moves toward vrunning position, it relieves the field arm of its spring tension 'so that when running conditions are established, the iield arm will remain in any-position in which it is left.

The starting armas retained in the runningthe usual manner by a no-voltage magnet and upon failure of voltage both arms return to their initial positions.

In the accompanying drawing in which I have shown one embodiment of my invention, Figure 1 is shcwingthe circuit connections; Fig. 2 is a similar view on a smaller scale with the parts in running position, the field arm being turned so as'tothrow a-resistance into the iield circuit and speed u the meter; and the working parts of my device. v

.arm 13 is pivoted vary the starting resistance.

eneral control of the motor to the lull field position. The two a plan view orny device the motor and back to 4line' 33.-

ing base of slate or soa -stone having 'mounted thereon a series o contacts 11 arranged in the are of a circle and forming 'the 'termiL nais of starting resistance 12. A contact 15 at its free end engages the studs 11 to The arm is biased or spring-pressed to starting position against the stop 16 by means of a s ring 17. An operating handle 18 is mounts to' turn in the arm 13 and has secured to it a gear 19. The arml is preferably bent as shown s0 thatthe handle will have ajbearing in the bent portion 20 as Well as inthe upper portion and bearings. A. 11o-voltage magnet 21 @is arranged to retainthe arm in the runningposition in the usual Way. A series of -contact studs 22 arranged in the arc of a circle f orm the terminals of ield resistance 23. A controlling arm 24 pivoted at 25 is l,inounted to rotate so that its free end engages the 4studs 22 to varythe biased to its initial position as shown in Fig. 1 by means ofthe spring 26, Ione end of 'which bears against the pin 2 7 inthe base andthe other end against the pin 28 on the hub gear 2 9. This hub gear is secured 'to and rotates with the arm 24. The end ofthe spring 26, which engages the in 28, has an extension 3G beyond. the pin ying in the pathoi the arm 13 so thatas Wards running position it engages the s ring andforcing it away from the pin 28 reL eyes. the ltension on the arm 24. When thgarm 12 reaches running position, in engagement with the rio-voltage magnet 21 the gearlQ- will mesh with the gear 29 so that by turinnv iield resistance. This arm is.

the arm i3 is moved to- ;nefsrfng to the drawing, 1o is samurai.-

atl/1 sothat the contactor the handle 18 the arm 24 may be turne through'the gear connections. l

The arrangement of circuitsand the mode of operation are as follows: When the arm 13 is .turned to theright by: means ofthe handle 18 to start the motor-,current passes from the line 31v through the arm 13, starting' resistance 12, conductor 32, armature A of time the field circuit arm 13, con uctor 34,' armi-4 At the saine" thence through field F'to line 33. When the arm reaches running .position and is held there by the non-voltage magnet, th Spring.

tension on the arm 24 is relievedand at the same time gears 18 and 29 are brought into mesh. By then turning the handle 18 the field control arm 24 may be turned as shown in Fig. 2 sc as to speed up the motor. Upon failure of voltage arm 13 will return to starting position and the spring tension being once more returned to the arm 24,- the latter will also return to its initial position.

It Will thus be seen that l have provided a very simple device for starting the motor and lcontrolling the speed thereof, the arrangement being such that the motor is always started With a maximurniield strength. It will be understood, of course, that various modiiications of my device will suggest themselves to those skilled in the art Without departing from the spirit ol' ymy invention, the scope of which is set forth in the annexed claims7 y What l claim as new, and desire to se-A cure by Letters Patent of the United States,

1S j1. A controlling device for electric motors comprising a pair of resista-noos, each provided With aii independent controlling arm, and means in connection with one of said arms and inoperative until the arm stops at a predetermined position for moving the second arm to vary its resistance. i

2. A controlling device for electric motors comprising a starting and a field resistance provided with independently movable controlling arms, and means for rendering the held. arm operative only When the starting arm is in running position.

3. A controlling device for electric motors comprising a pair of resistances, each provided With an independent controlling arm, and means mounted upon one ol' said arms and inoperative until the arm stops at a 'predetermined position for moving the secon arm to vary its resistance.

4. A controlling device for electric motors comprising a starting resistance and a eld resistance, each providedv With an independent controlling arm, and means movable With the starting yarm and inoperative untilA the arm stops at v'its running positionlfor moving the field arm to vary its resistance.

5. A controlling device for electric motors comprising a pair of resistances, each provided With an independent controlling arm `'biased` to an initial position, and means.

whereby thebias is removed from one of said arms as the other is moved from its initial position.

6. A controlling device for electric motors comprising a starting resistance and a eld resistance, each provided with a springreturnedcontrolling arm, and means Whereb from t e eld arrn. as the starting arm is moved tovvardslrunning position.

.arm reaches running position.

the spring tension is removed.

7. A controlling device for electric motors comprising a spring-returned starting mechanism and a no-voltage magnet thereforr a field controlling arm, and a device movable spring-returned eld controlling arm, means for removing the spring tension from the field arm when the starting mechanism.

reaches running position, and a device movable With the starting mechanism and inoperative until the running position is reached for moving the field arm. y

9. A controlling device for electricmotors comprising a pair oi' resistances, each provided With an independent controlling arm, and gearing upon said armsvarranged toy mesh so as to o crate one armvlrom the other When the atter reaches a predetermined position.

1G. A controlling device forelectric motors comprising a pair of resistances,

each provided With an independent conr trolling arm, an operating handle for one ofsaid arms, and a gear connection between said handle and the other arm for moving thelatter arm when the operating arm reaches a predetermined position.

' 11. A controlling. device for electric motors comprising a resistance, a controls ling arm therefor having an operating handle movable on said arm, a gear driven by said handle, a second resistance controlling arm rovided With a driving, gear, -said gears eing arranged to mesh so as to drive the second arm from the operating handle When the first arm reaches a predetermined position.

12. A controlling device for electric motors comprising a spring-returned starting mechanism having an operating handle movableindependently thereof, a field controlling arm and caring arran ed to mesh between said hand e and said lie d arm When the starting mechanism is in running position.

i3. A controlling' device for electric motors comprising a starting resistance, a controlling arm therefor havin anV operating handle movable .independent y thereof, a gear driven by said handle, a lield resistance and a controlling arm therefor having a driving gear mounted thereon, said gears being arranged to mesh when the startin 14. A controlling device for electric motors comprising a starting resistance, a spring-returned controlling arm therefor, a gear and means for driving the same mounted upon said hair-ie, a iield resistance, a eRriIig-retumed 'conto1li1ig.. therefoi, a drive gear for 4said 'rm,jf lgears being,v ananged to itieshn Whe starting armreaches -Posiio1 1f`,-1avnd 5 means for removing the spring; tension from the field arm when the. storting ami rex'ihes.`

running position.

{fin-Witness whereof, have herelintlL-:Qi

said .ngy hgndmhis Hirst day of July, 1907;

the '1. WILLIAM o. YAT'ES;

" BENJAMIN B.,HUL1., HELEN O BFonD. 

